Pulley.



110.888,171. PATENTED MAY 19.1908." T. A. JONES. PULLBY.

APPLICATION FILED MAR. 25, 1907.

rus Mouais crans co.,wAsmNc-1on, n. c.

UNITED sTATEs PATENT OEEIOE.

THOMAS A. JONES, OF CHICAGO, ILLINOIS.

PULLE'Y.

To all whom/t "may concer/a:

Be it known that I, THOMAS A. JONES, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Pulleys, of which thefollowing is a specification.

My invention relates to improvements in pulleys, and more particularlyto relatively large power pulleys provided with peripheral facings ofmaterial of relatively high frictional qualities.

One of the objects of my invention is to provide a pulley of thecharacter described wherein the frictional facing of leather or othersuitable material is adequately anchored and positioned againstcircumferential'or lateral creeping or displacement, and against lateralenlargement.

Another object of my invention is to provide cheap and convenient meansfor effecting the anchorage of the friction surfacing material.

Other and further objects of my invention will become apparent to thoseskilled in the art from the following description, taken in conjunctionwith the accompanying drawing; wherein;

Figure 1 is a side elevation with fragments in section, of a pulleywheel constructed in accordance with my invention; and, Fig. 2 is atransverse section on line 2 2 of Fig. 1.

In the drawing, 5 indicates in general the 'frame of the pulley,comprising the usual hub 6, spokes 7, and rim 8. The peripheral surfaceof the rim is preferably crowned and uniformly channeled throughout itsentire periphery, to provide a crown-bottomed recess 9, laterallybounded by projecting flanges 10 integral with the body, and makingpreferably undercut or acute angle oints with the surface 9 of therecess. In the peripheral surface of the recessed portion of the rim 8,at suitableV intervals both transversely and circumferentially of therim are provided inwardly tapering recesses 11, which are preferablyarranged in transverse rows across the recessed portion of the rim andat equal intervals ap art circumferentially thereof. In these recesses11 are seated studs 12, having bases shaped corresponding with therecesses 11 and conical points of suitable elevation to projectmaterially beyond the surface of the recessed portion of the rim, but toan extent less than the elevation of the flanges 10.

Specification of Letters Patent.

Application filed March 25, 1907.

13 indicates the friction facing material, which is preferably leather,of such width and thickness as to completely fill the recess 9 and makeintimate contact at its side edges with the flanges 10, such materialbeing chamfered at its edges to fit the undercut surfaces of the flanges10. Such surface material is preferably greater in thickness than theheight of the flanges 10 to provide for wear of the leather, and toprevent the flanges from holding the belt off of the traction surface ofthe pulley, so that the peripheral surfaces of said flanges constituteno part of the driving peripheral surface of the pulley completed. Thefrictional surfacing material 13, when of leather, is preferably asingle piece or band having its ends joined with the scarf joint in amanner well known in the art, and it is applied so tightly in that thepoint of the anchor members 12 are buried in the inner surface of thebelt to hold the same. It may also be cemented to the metal face of thepulley. It will be observed that the surfacing material when thusapplied is easy of application, as the application may start at one endof the strip and succeeding portions of the facing material pressed orhammered into place upon the contiguous anchor points, and whencompletely in place with its overlapping ends secured in the usualmanner the frictional surfacing material is firmly held againstperipheral creeping or movement at a large number of independent basepoints. When starting to place the friction material on the rim theslanting, scarfed end may be riveted to the rim of the pulley, as shownat 14, and the overlapping finishing scarfed end will overlie theholding rivets and hide them from view. Lateral enlargement, andmovement or displacement of the surfacing material is also prevented bythe flanges 10, the surfaces whereof resented for Contact with thefrictional bocy 13 being undercut, and well adapted to securely hold thefrictional material against lateral displacement, thereby relieving theanchors 11 of lateral strain. Vhile the anchors 11 may assist whennecessary in taking up such lateral strain it will be apparent that onany given transverse line the number of anchor points tending to holdthe material against lateral shifting are relatively few in comparisonwith the number of points which tend to hold any circumferential area ofthe belt against circumferential displacement. Therefore, I regard theprovision of the side flanges as highly advantageous. Furthermore, itwill be observed that the'character of the anchoring devices is such asto not interfere with the removal of the friction surfacing materialWhen such removal is deemed advisable, as obviously as soon as thejoining ends of the surfacing band 13 are separated the band may bestripped off by pulling it radially outwardfrom the points of anchorage.I have found furthermore that this construction may be very cheaplymade, as it is not essential that the anchoring members 12 be shaped orfitted With any degree of nicety,which Would require especiallypainstaking Work, for it will be noted that the anchor points areentirely confined on all sides by coacting rim and surface members ofthe pulley, so that they cannot readily Work loose or become unseated.

The under cutting of the side flanges and the corresponding chamferingof the edges of the frictional material is highly advantageous, as thismeans prevents the marginal edges of the frictionalmaterial from raisingfrom the face of the pulley and produces aV finished smooth product.

Having thus described my invention, What l claim and desire to secure byLettersv Patent, of the United States, is:

ln a pulley of the character described, an integral rim having in itsperiphery a continuous recess bounded by fianges integral with the rimhaving their proximate surfaces undercut, said rim being provided with aplurality of tapering recesses suitably spaced apartthroughout itslateral and peripheral extent, a stud seated in each recess having atapering base and a conical point projecting beyond the surface of thebottom of the ref cess a distance less than the depth of the recess, anda yielding frictional surfacing member fitting snugly in said recess inintimate contact with bottom and sides With the corresponding surfacesof the recess, and having embedded therein the points of the studs, saidsurfacing material being thicker than the height of the flanges boundingthe recess.

In testimony whereof l hereunto set my 4 hand in the presence of twoWitnesses.

THOMAS A. JONES.

In the presence of- .GEORGE T. MAY,.Jr., MARY F. ALLEN.

